fisher



2 Sheets-Sheet 1.

E. FISHER & JJW ATSON, Die for Forging Metallic Horse-Collar Frames,

NO. 226 737. Patented April 20, I880.

A TORNBYS.

' 2 Sheets-Sheet 2. E. FISHER 8v J. WATSJO N, Die for: Forging Metallic Horse-Collar Frames,

No. 226,737. Patented April 20, 1880;

WITNESSES: (a? NVENTOR:

points a b be placed horizontal, so that the outer wall, 1?, of the cavity would also be horizontal, or nearly so, then. a greater difiiculty arises, since the inner wall of the die-cavity must in such case be vertical and the enter one ap 'n'oximately horizontal, so that the blank swaged in such form of cavity has its flanges at too great an angle to allow the inner one to be bent inward by the finishing-die without stretching the metal unduly and cracking the metal at the point of greatest curvature. At least this will be the ordinary result. In brief, if the part of the die-cavity between a. I) be placed at any lateral angle which is near either the vertical or horizontal, then so good results cannot be obtained, since either one flange or the other of the collarframe section cannot be properly-that is, sufficiently-curved in the first operation of the die, and hence cannot be subsequently reduced to the desired conformation with ease and safety; but when the relation of parts is as shown in the drawings we find the diiliculty greatly overcome,since the outer flange of the collar-frame section not only receives its finished form, but the inner flange is bent or curved so far inward that it is far less liable to crack in the final bending operation to which it is subjected in the finishing-die.

While such advantage attends the placing of the shorter portion, u. b, of the die-cavity at the lateral angle stated, we [ind that a correlative but more important one is obtained by the form of the larger end of the plunger A- namely, by the slope or bevel c of the outer wall of the cavity between points a I). \Ve have found that when the wall is not thus sloped orcut away it is dillicult, and in nearly all cases impossible, to produce a collar-frame section having the desired perfection of form, and without a crack, buckle, or other likcdefeet.

\Vithout giving a detailed explanation of the reason of such result following the operation of a die thus constructed, it is sulilicient to state that the proper redistribution of metal along the edges of the metal plate and between points cannot, in general, be efl'ected so long as the height of the outer wall, (I, of the die-cavity is maintained at the end 0, or so long as it is high enough to hinder the shorter arm, f, of the plate (3 curving downward and invard under the action of the cameo die or plunger A. We prefer, for the best results, to cut away the wall nearly down to a level with the bed of the cavity, as shown in Fig.3; but something less than this may answer a very good purpose.

When this plate is placed on the matrix B and the plunger A. brought down upon it the inner edge of the plate is finished, so far as this die permits, and held firmly against the inner wall, 0, of the die-cavity, and as the plunger A continues to descend the shorter curved arm of the plate U is bent laterally and downward-that is lo say, in an oblique direction corresponding to the inclination of that part of the die-cavity which lies beneath it. The shorter arm 1" of the plate G is, in fact, twisted inward and downward, and to allow such curvature the plate must stretch or draw out somewhat thinncron the outer edge between points g h, Fig. l, and to still greater thinness on the inner edge between points We, else the plate would crack at those places and buckle at others, and theoperation be a complete failure'l To facilitate such twist and curvature of the plate, so as to bring it into the position shown in the blank, Figs. 3, 9, the outer corner or side of the shorter arm f must be allowed freedom of movement. In other words, it should be left free to sweep inward on a curve until it rests on the bed of the sloping portion of the cavity shown in Figs. 3, 6. This result is secured by cutting away or sloping the wall of the matrix B at the point a, as before stated. This feature-to wit, the slope 0 of the matrix-wall d-co-operates with the oblique inclination of the diecavity, or has a cer tain relation to it; but yet it is possible to obtain certain good results with it alone, or without the said inclination of the die-cavity.

When the blank F leaves the break-down die ithas the form shown in Figs. 2, 3, and is completely formed, except on the inner side and at the ends. It is then placed on the bed portion E of the finishing-die and the matrix I) brought down upon it. The wider lip or flange Z of such part D impinges on and thus holds or stcadies the blank, while the inner flange, m, which is shorter, acts on the inner flange of the blank and gives it the curve it is required to have in the finished collar-frame section F, which is represented in Fig. 9, and this is accomplished without danger of cracking or distorting the blank.

\Ve construct our flanged steel collar with an eye at the upper end of the sections, for the purpose of hinging them together, and with lips or claws at the lower end to receive and hold a sliding adjustable coupling, thus dispensing with fastenings, which require to be riveted on. It is desirable and important that such eye and claws shall be constructed in one piece with the body of the sections. We therefore cut the steel plates 0 with a lengthwise projection or extension,:0, Fig. l, at its upper end, and lateral projections or extensions 1) p at its opposite end. These receive a certain degree of curvaturein the break-down die, as will be seen by reference to Figs. 2, 6; but in the finishing-die D E the lateral flanges p p are bent still farther inward, so as to be parallel in the, finished blank F, Fig. 9, while the projection or flange o is bent inward at a right angle, or thereabout.

The matrix 1) has a recess, r, to receivethe horn or an gt; lar projection .s' of the lower part, .19, of the die, by which means the flange 0 is bent to the angle shown. The respective flanges 0 p are thus brought into the form which adapts them to be most easily shaped by subsequent forging into the eye and lips or claws, which they become in the completed collar-section.

The side of the bed part E of the finishingdie is cut away on the under side, as shown at t in Fig. 8, to allow space for the curved outer flange of the blank F, so that the latter may be placed on said part E and the complete collar-section F removed from it without being obstructed by the lateral bulge of the die. We have referred to the blank F shown in Fig. 9 as being finished, or in the form required for the complete collar-frame section; but the edges of the blanks may be rolled in still farther, in order to give the complete collar greater strength.

What we claim is 1. A partible break-down die for use in forging a section of. a metallic horse-collar frame, consisting of the plunger A and the matrix B, which has the shorter portion of its cavityto wit, the part included between the points tub-placed at an oblique inclination, preferably at an angle of about forty-five degrees, substantially as set forth, for the purpose stated.

2. A partible break-down die for use in forging a section of a metallic horse-collar frame, consisting of the plungerA and the matrix B, whose outer end wall, 6, is cut away or sloped, substantially as set forth, for the purpose specified.

3. The partible break-down die consisting of the parts A B, having corresponding obliquely-inclined portions, and the maxtrix having its outer end wall sloped, as shown and described.

4. As an improvement in blanks from which to manufacture collar-sections of sheet-steel, the projections 12 p, as shown in Fig. 1, for the purpose set forth.

5. The partible finishing-die having the form shown, to adapt it to act on the blank as it comes from the break-down (lie, the partsD E of the same being respectively provided with the cavity and horn, as shown and described, for the purpose specified.

6. The combination of finishing-die, consistin g of parts D E, with the break-down (lie, consisting of the parts A B, the latter having the oblique inclination of their contact surfaces, as specified.

7. Thelower part, E, of the finishing-die, having its side undercut beneath the bulging portion, as shown and described.

The above specification of our invention signed by us this 23d day of December, A. D. 1879.

E. FISHER. JOHN WATSON.

Witnesses:

SoLoN O. KEMoN, AMOS W. HART. 

